An ocean-conservation math game for kids, built by a Durham healthcare worker for his five-year-old.
Kids solve age-appropriate math — from tap-to-count for toddlers up to times tables — to clean trash out of ten illustrated oceans. Every few correct answers rescues a real sea creature, narrated with a true marine-biology fact, and coins earned fund a wildlife sanctuary that rescued animals swim home to. No ads, no accounts, no chat, no data collection, and every purchase sits behind a parent-only math gate.
Watch on YouTube · Download trailer (MP4, 10 MB)
Seasonal trailers: Jelly Bloom (November) · Midnight Trench (October) · Beach Cleanup (September) · All videos
Click any image for the full-resolution PNG. Download the icon (512px).
| Developer | Spangler Development LLC — solo developer Stephen Spangler, Durham, North Carolina |
| Released | September 2026, iOS and Android. Latest update November 2026: Jelly Bloom, an ocean of seven glowing jellies, and the Net Rescue hunt. |
| Price | Free. Two complete oceans free, plus seasonal oceans (Midnight Trench in October, Jelly Bloom in November) free while they're open; six more as one-time unlocks ($2.99 each or $7.99 for all). No subscriptions, no consumables. |
| Ages | 2–10 — five parent-selectable math levels, from first counting to multiplication and division. Fully voiced for pre-readers. |
| Curriculum | Practice toward Common Core math from Kindergarten to Grade 3 (K.CC.B.4, K.CC.B.5, K.OA.A.5, 1.OA.C.6, 2.NBT.B.5, 3.NBT.A.2, 3.OA.C.7) and England's EYFS Number to Year 4 times tables. A practice game, not a full course. |
| Content | 70 real sea creatures, including 10 legendary rescues, each with a true conservation fact. Rated 4+ (App Store, Made for Kids) / Everyone (Google Play). |
| Recognition |  Educational App Store Certified — five stars in an independent review by educators, September 2026. Badge (PNG) |
| Safety | No ads, no accounts, no chat, no data collection. Purchases open only after an adult solves a multiplication problem. Privacy policy. |
| App Store | apps.apple.com/app/id6805512356 |
| Google Play | play.google.com/store/apps/details?id=com.spanglerdev.reefrescue |
| YouTube | youtube.com/@reefrescuegame |
| Press contact | support@spanglerdevelopment.com |